Creating your own maps for Garmin units

I have some very good paper topo maps (1:25000) of places in Europe where I will be riding this summer. I am planning to buy a Garmin (probably a Vista HCx) and I was wondering if anyone has experience scanning paper map, scaling and referencing them then uploading them to a Garmin unit

I have some very good paper topo maps (1:25000) of places in Europe where I will be riding this summer. I am planning to buy a Garmin (probably a Vista HCx) and I was wondering if anyone has experience scanning paper map, scaling and referencing them then uploading them to a Garmin unit